<template>
  <div class="cmt-container">
    <h3>发表评论</h3>
    <hr>
    <textarea placeholder="请输入要BB的内容（做多吐槽120字）" maxlength="120" v-model="msg"></textarea>
    <!-- 这是mint-ui的组件mint-ui -->

    <mt-button type="primary" size="large" @click="addmsg">发表评论</mt-button>

    <div class="cmt-list">
      <div class="cmt-item" v-for="(item, i) in comments" :key="item.add_time">
        <div class="cmt-title">
          第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.user_name }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}
        </div>
        <div class="cmt-body">
          {{ item.content === 'undefined' ? '此用户很懒，嘛都没说': item.content }}
        </div>
      </div>

    </div>
    <mt-button type="danger" size="large"  @click="getMore">加载更多</mt-button>
  </div>
</template>
<script>

import { Toast } from "mint-ui";
export default {
  data() {
    return {
       pageIndex: 1, // 默认展示第一页数据
      comments: [],
      msg:""
    };
  },
  created() {
     this.getcomments()
  },
  methods: {
    getcomments() {
      this.$http.get("api/getcomments/" + this.id + "?pageindex=" + this.pageIndex).then(result => {
        if (result.body.status === 0) {
            this.comments = this.comments.concat(result.body.message);
        }else{
            Toast("获取评论失败！");
        }
      });
    },
    // 点击一次再一次获取第二页数据
     getMore() {
      // 加载更多
      this.pageIndex++;
      this.getcomments();
    },
    //zui追加数据
    addmsg(){
      this.$http.post("api/postcomment/"+this.id,{
          content: this.msg.trim()
        }).then(function(result){
          if (result.body.status === 0) {
            // 1. 拼接出一个评论对象
            var cmt = {
              user_name: "匿名用户",
              add_time: Date.now(),
              content: this.msg.trim()
            };
            this.comments.unshift(cmt);
            this.msg = "";
          }
      })
    }
  },
  
  //props指向父亲属性id.拿到父亲的值
  props: ["id"]

};
</script>

<style lang="scss" scoped>
.cmt-container {
  padding-bottom: 50px;
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }

  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        line-height: 30px;
        background-color: #ccc;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>
